Unlike the more conventional high rate discharge tester, the BAT 121 is used for load free testing of 12V start batteries. The tester is independent of electrical mains and is portable. Batteries can be checked both in the machine or on the bench.
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Bosch Battery Tester Bat 121 Manual Muscle. Like all completely automated Bosch units, it is designed to carry out the maintenance of R-134a-based.
The BAT 121 can also act as a generator tester for 12V ac generators, and as a voltmeter. However, the unit is designed for 12V only. 6V batteries show up as undervoltage, and 24V batteries as overvoltage, which cause the unit to automatically shut down.
The battery to be tested need not be charged. It is just a matter of connecting the tester across the battery and carrying out tests.
Main use of the BAT 121:
This tester is mainly used to detect starting batteries with significantly reduced starting power, before they fail completely. Consider this- if you are faced with a machine that is bad at starting, list the possible causes:
In order to minimise machine down time, it is important that the technician can make a swift and accurate diagnosis of the problem. If you suspect the battery is at fault, the BAT 121 can be used to confirm this.
Information required to use the BAT 121:
The tester requires the following information, to use as a reference when testing a battery:
This battery test delivers the most accurate results if no charging or current consumption has taken place on the battery for at least 1 hour prior to the test. If the results of the test are borderline, it may be necessary to conduct successive tests, after the battery has been discharged and charged.
Alternator Testing and The BAT 121:
The BAT 121 can also be used for alternator testing. Simply select the option from the menu and then follow the on-screen instructions. The instrument will go through a test routine where you are asked to run the engine with no electrical loads, then asked to switch on electrical loads. Once these instructions have been complied with, the machine will return a report on the condition of the charging system.
As well as reporting on the output of the charging system, the machine can also report on ripple from the alternator.
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